508296-G01 / 31-5000753
Page 17 of 24
Issue 2231
RAST 6-PIN
CONNECTOR
RAST 6-PIN
CONNECTOR
VARIABLE CAPACITY
OUTDOOR UNIT
TWO STAGE /
VARIABLE SPEED
GAS FURNACE
CONVENTIONAL 24VAC
THERMOSTAT
W
L
Y2
Y1
O
DS
C
I+
I-
R
DF
TST
Y1
O
C
W1
R
G
TC
TO
ACC2
ACC1
Y1
O
DH
C
W2
W1
R
G
DS
W2
O.D. SENSOR
OPTIONAL
R2
Y2
Y2
FOR SINGLE STAGE OPERATION INSTALL A JUMPER BETWEEN Y1 TO Y2 ON THE OUTDOOR UNIT
TERMINAL STRIP
FOR SINGLE STAGE OPERATION INSTALL A JUMPER BETWEEN Y1 TO Y2 ON THE OUTDOOR UNIT
TERMINAL STRIP
RAST 6-PIN
CONNECTOR
RAST 6-PIN
CONNECTOR
VARIABLE CAPACITY
OUTDOOR UNIT
SINGLE STAGE FURNACE /
PSC AIR HANDLER
CONVENTIONAL 24VAC
THERMOSTAT
W
L
Y2
Y1
O
DS
C
I+
I-
R
DF
TST
Y
C
W
R
G
TC
TO
ACC2
ACC1
Y1
O
DH
C
W2
W1
R
G
O.D. SENSOR
OPTIONAL
R2
Y2
CONSTANT TORQUE /
VARIABLE SPEED
AIR HANDLER
RAST 6-PIN
CONNECTOR
RAST 6-PIN
CONNECTOR
VARIABLE CAPACITY
OUTDOOR UNIT
CONVENTIONAL 24VAC
THERMOSTAT
W
L
Y2
Y1
O
DS
C
I+
I-
R
DF
TST
Y1
O
C
W1
R
G
TC
TO
ACC2
ACC1
Y1
O
DH
C
W2
W1
R
G
DS
W2
Y2
Y2
O.D. SENSOR
OPTIONAL
R2
FOR SINGLE STAGE OPERATION INSTALL A JUMPER BETWEEN Y1 TO Y2 ON THE OUTDOOR UNIT
TERMINAL STRIP
Figure 10. Conventional 24VAC Cooling Thermostat
Wiring - Single Stage
RAST 6-PIN
CONNECTOR
RAST 6-PIN
CONNECTOR
VARIABLE CAPACITY
OUTDOOR UNIT
TWO STAGE /
VARIABLE SPEED
GAS FURNACE
CONVENTIONAL 24VAC
THERMOSTAT
W
L
Y2
Y1
O
DS
C
I+
I-
R
DF
TST
Y1
O
C
W1
R
G
TC
TO
ACC2
ACC1
R2
Y2
Y1
O
DH
C
W2
W1
R
G
DS
W2
Y2
O.D. SENSOR
OPTIONAL
FOR TWO-STAGE OPERATION CUT THE TWO-STAGE COMPRESSOR (Y1 TO Y2) ON-BOARD
LINK (W915)
RAST 6-PIN
CONNECTOR
RAST 6-PIN
CONNECTOR
VARIABLE CAPACITY
OUTDOOR UNIT
SINGLE STAGE FURNACE /
PSC AIR HANDLER
CONVENTIONAL 24VAC
THERMOSTAT
W
L
Y2
Y1
O
DS
C
I+
I-
R
DF
TST
C
W
R
G
TC
TO
ACC2
ACC1
R2
Y2
Y1
O
DH
C
W2
W1
R
G
Y
O.D. SENSOR
OPTIONAL
CONSTANT TORQUE /
VARIABLE SPEED
AIR HANDLER
RAST 6-PIN
CONNECTOR
RAST 6-PIN
CONNECTOR
VARIABLE CAPACITY
OUTDOOR UNIT
CONVENTIONAL 24VAC
THERMOSTAT
W
L
Y2
Y1
O
DS
C
I+
I-
R
DF
TST
Y1
O
C
W1
R
G
TC
TO
ACC2
ACC1
R2
Y2
Y1
O
DH
C
W2
W1
R
G
DS
W2
Y2
O.D. SENSOR
OPTIONAL
FOR TWO-STAGE OPERATION REMOVE THE Y1 TO Y2 JUMPER
2
2
Figure 11. Conventional 24VAC Cooling Thermostat
Wiring - Two Stage